After install and login nothing works

After install nothing works. I could login but nothing works. so I use softaculous and I get error .ocdata
how do you install this thing

Ok I got it I had to delete the web cache on fatcow server
But now I have a problem. You don’t have permission to upload or create files here.
How can I fix this? Is there a folder that I need to set permissions or is this in admin settings